search
for
 About Bioline  All Journals  Testimonials  Membership  News


Nigerian Journal of Physiological Sciences
Physiological Society of Nigeria
ISSN: 0794-859X
Vol. 32, No. 1, 2017, pp. 37-46
Bioline Code: np17007
Full paper language: English
Document type: Research Article
Document available free of charge

Nigerian Journal of Physiological Sciences, Vol. 32, No. 1, 2017, pp. 37-46

 en Uptake of Zinc by Pteridium aquilinum check for this species in other resources (Bracken fern) and Response of Clarias gariepinus check for this species in other resources Juveniles During Chronic and Sub-lethal Exposure
Olaifa, Flora Eyibio & Fabusoro, Abiola A.

Abstract

Summary: Zinc is an essential trace element but can be toxic to fish at elevated concentrations. This study was carried out to assess the uptake of zinc by Clarias gariepinus juveniles and Pteridium aquilinum during chronic exposure to sub lethal concentrations. Two experiments (five treatments each: 0.0, 0.8, 1.60, 2.40 and 3.2mg/l zinc chloride) were undertaken simultaneously in static renewal bioassays for 28 days. One experiment contained 3-4 fronds of P. aquilinum per tank and the other without it. Each treatment had two replicates (Each having ten C. gariepinus juveniles mean weight 29 ± 2g, length 8 ± 3cm). Haematology, histology, zinc accumulation in tissues of C.gariepinus and P. aquilinum were recorded fortnightly. Packed Cell Volume, haemoglobin concentration, Red Blood Cells, White blood cells, Lymphocytes, Neutrophils, Mean Corpuscular Volume, Mean Corpuscular Haemoglobin Concentration and Mean Corpuscular Haemoglobin of C. gariepinus varied with increasing exposure period. RBC, WBC, LYM, and NEUT differed significantly (p<0.05) among treatments. Histology (Gills, Kidney and Liver) showed lesions of varying intensities depending on zinc concentration. Bioaccumulation of zinc in organs of C. gariepinus differed significantly (p< 0.05) with gills at 1.6mg/l Zn having the highest. Zinc in P. aquilinum differed significantly (p<0.05) with treatments, exposure period and concentration, with the highest concentration (22.91 ± 2.72 mg/g) at 1.6mg/l of Zn. P. aquilinum absorbed zinc from the water but did not show hyperaccumulator status in this study.

Keywords
Phytoremediation; Bioaccumulation; Bracken fern; Clarias gariepinus; Haematology; Histology

 
© Copyright 2017 - Physiological Society of Nigeria

Home Faq Resources Email Bioline
© Bioline International, 1989 - 2024, Site last up-dated on 01-Sep-2022.
Site created and maintained by the Reference Center on Environmental Information, CRIA, Brazil
System hosted by the Google Cloud Platform, GCP, Brazil